Players will see new planets and star systems, new areas of the Citadel and meet new characters to further flesh out the game's story and flesh out the history of the Reapers.

Images of the DLC show Shepard piloting a mechanical suit in an underwater environment as well as a Reaper-infested industrial area, revealing that at least two new planets will be available. Players can also unlock the new AT-12 Raider shotgun and M-55 Argus Assault Rifle weapons.

In addition to 'Leviathan', BioWare also revealed the 'Firefight Weapon Pack' DLC. It will offer "two powerful new weapons and five bonus weapons" for the single-player campaign.

The 'Firefight Weapons Pack' will be available for $1.99 (£1.36 / 160 Microsoft Points) on PC, Xbox 360 and PlayStation 3 starting August 7.

The 'Leviathan' DLC will be available for $9.99 (£6.80 / 800 MS Points) on PC, Xbox 360 and PlayStation 3 later this summer.

EA also today revealed that Mass Effect 3 will be a launch title on Wii U this holiday season. It was not mentioned whether the 'Leviathan' DLC will be included in the Wii U version or if that will be DLC after the game is released.